Method and apparatus for reproducing sound



April 18, 1933. w. H. BAUCH 1,904,711

METHQD AND APPARATUS FOR REPRODUCING SOUND Filed Sept. 20, 1929 s Sheets-Sheet 1 gwgxmtou WiIIiamHBauch April 18, 1933.

w. H. BAUCH 1,904,711

METHOD AND APPARATUS FOR REPRODUCING SOUND Filed Sept. 20, 1929 3 Sheets-Sheet 2 Jwucmtoc Wil liamH Bauch April 18 1933. w H BAUCH' 1,904,711

METHOD AND APPARATUS FOR REPRODUCING SOUND Filed Sept. 20, 1929 3 Sheets-Sheet 3 H'n'EiiiiiiiTE W 15 i 257 ving and reproducingsound mhaasspe ohi,

Patented 18, 19.33

WILLIAM H. raven, orsnmsmi'm, im'lwiimssmnqn O mefi fi fI-Y i37 PLATTER, or non'rnvmmom running, Ann own-1mm ro' sononou rnnnr. coaronn'rron, or mnranaroms INDIANA, A"CQBPQRATIOKQFQINDIANA Application m d Septe ntr 20;1929. Serial no'.,1ae4, 11o.' V a 'Thisinvention relates to the art of music or othersounds or waves andpartic ularl to photographically. recording sound on a lm and reproducing-it therefrom; jffThe J invention isprimarily designed to beused in connection with motion pietures in which it is desired to synchronize music on speech with the picture which isfbein'g pr ojeeted. V In general the object of the invention-rs to provide new and improved apparatus for so-called talking pictures which willb implesin construction and in operation, ,3 Referring to the accompanying drawings, which are made a part hereof andvon which similar reference characters indicate similar parts, t Figure 1, is a .perspectiveiview of a motion picture machine showing I my sound; reproducing apparatus applied t'heneto, E i '7 Figure 2 is aperspective 'viewyof thedrivingme'chanism for the machine, "Figure 13 is a section onlinei3 ;3. ofEig-, 11I'e2, '1 v I q it w Figurez l isa-viewlinielevation on amen larged scale kof the sound reproducingunit,

F iguref) is a perspective View of a as seenfrom line .5--5 :of Figure 4;; Q-

Figune dis a plan view of theilight: unit as seen from line 66:=of Figure '4,

Figure 7 is a section on line 17- 7 off ure4,

' I Figure '8 .is a diagrammatic Wiew showing the lamp, the slit, :andthelenses tor focussing the light on the-light. sensitive slitiyand onthefihn' and Figure 9 is a view Figewes i -pictu e and sound film.

In :the drawings reference dicates a picture projecting machine'of' any well known construction in wihi'ehinumeral 11 indicates the reel from WhiehFthe fih-nuis thefilmwhichiin thiszcaseiis providedwvith the usualivnotches 14 'by meansjof :whichfit .is driven with.aspronketwheel 1'5 .ahd'liis alongits edge upon whichthe soundrecord endklllThe shaft 18 also \preferablyi -is pros v 23. "A pluralityfof .be1tsf124provide driving.-

' a noiseless drive ,="the belts 24 acting to cushg s no with p a; tin-155w margiigjm.

hown as a whole inrFl gure if is the is ghotographi'callyl in'ipresjs'ed,if. l .7' repreducing. unitlf [This cons ist's oj a ion the sprocket wheelie ismount'' ed, thenshaft extending out ofa housing 17 andhavi-ngfa grooved pulley 18 on its outer vided'apinion 19.7 motor2Q 'ha'sja; motor shaft'2l onr the;;end of; whichIa-re mounted a grooved pulley;2i2 and a pinion connection between the. pulleys 2:2 and 'an idle pinion '25; provides drivingQcon neetion'between the pinion23 'and theipinion v i 19; Theshaft16 istherefore drivenlooth V a-heItand :a positive gear drive. The purpose ofthis driving connection is to give, a! positive :drive and at the (same time ion the driving contact between the pinion'sg I may find it desirable attimes to :displen'se with the ,a gear drive and- "drive :w 'ollyl this: helt drive .very effective since ,a'plurality Great I.arn;insured :a perfect j" V drive since the tendency ofan-y .onebelt of p p .thee groups to slip will 'beiovercome hyithe remaining belts iurnishingaiconstantldrive; 339 i mustang speed in: order to give; the di ji d even to; the sound or music whichmay j boil! the process of heingrep'roduced;bylthe- 1 machine. Secured within the casingQlTis-a roller 26 around ,whi'ch the film 13 pas's'es in' trues-to have the filni engage the. sprocket 'wheelj through -u aflf-relatively long' arcf to V p t i j y; w the; fi m P vid n greater' g -friction' contact with the sprocket? w en; The film-also engagesga ro l1er-1.-2-7 a 1 uponfeli teringithe sound reproducingcasing and passes betweena pair ofrollers 28'ir0m which-flit passes to the reel '12 uponwhiehit is wound. .An" arm" 29 is povotedfat- 30Ito the sensing and hasfion its Iouter e11d;a

45awhiefihe arrei and re t; a m the iplats lzfithd shaft 31 upon which a roller-'32 is nc mted,v the shaft 3l; ;heing heId tOI the arm 2 9 by. means cf-set screw33., A bracket 3l secu'red I to thejbackcf thecasi'n'g 171 21 an adjust- I able stop S CfeW BS'thfeaded through its end ffoi' engagement b'y'fthearm'29." bracket '36 secured to the casing has a leaf spring-37 c ui s 1 1 t-r he en of the af-isp i i positien "the roller ad aceriftthfispiockeui '1 tion of scnnd pictnfef the a filnf'il W111. pa s between thev roller 32 end spifc'c'ket' fend 1 c a rcund thefrcller 26'; the ce;back-between rs28 Wheni yi s r fts iel el ate a film "other than stalking fiimceie" 3f; will e gage the cute side .(if'thec 'i bll as "shownin jdotted line s' in Figiilr A in -I whichpcs'iticn it is held" out ofic cntact with the spiccketfl5fend passes directly through leaf spring 37 "when it is "desired to finsert' fa ftjidth; ,Theflens 411 5 positicned {screw '54; Elie b rrel; [mayth -e'foi' jiistedex-iailly' of the bracket and; secured in I T adjusted," positibhf bracketfl5 5 is 'se'ciired itch thecasingAlZ :by meansfcfiscrews '56.

r "-T l ap a u f f Pi di -i g" soun r fth i b rdj p e iou y m iupp -the filinii willfno'wl ibe described; IThisf'; ccnsists plates A lende positionedepert so as to' c t an? th S f F e olt'al o the v f to' be" adju'sted toward end mini-emf ether 7 tawdry, the Widthof the slit .462; Set screws .L4 9Hand' aire threaded tlir'oiighf theioliter. t the'cutr .iri a e; u)

however; limit myself "to f at y'fi partieule theflamp-aandits p'ai'ts; -Tl1eba1 'rel'395haS an opening in its side covered with afgl'ass I 72-"positio'ned adja'cent the nplaptes A f andf45 f so that the" operat-c f 'niay see 'just' when the 1 p light is ,prcperly' fojcussed cnflthe slit 456'. A 'A' 'bracket fliissecnredgtofgthelidnsing by means cfsetz' screwsy75, lhis bracket 8 cafi ies' pins 76 upon Which' a1 light sensitive -most position: -Alleveri 80 has-a Cami S111; 'face i18l'2ci1tto engegeia;can asui'face :82011 I r therlnenihei -iBy-meansicflthe calhlgslibi 'faces'SIRa'fi-d 82 op'ei'at ione the lefvfei' .80; "moves the member ,77: teward the bracket 5 51" I I legainstzthe thalek cf which hraeket-thef fihn '13 isg noyed-s r 'The-forwa 'cl endid the inem-f isipi'cv'i'denlgi with a name 83 which is Q film '2'steady -egainst vthe -I back ;bif@cket freme 8 3 is pressed tciyerd This hi'ecketihaseslit 57, the side" '1: i oftheslitbeingfchamfefed off to provide a] V very-thin portion to the bracket atithe polnt of the slit. The lamp 51 held in a socket; 68 Which spcket is'secuiiedfiin'echelder 58 which is nstable tow turd. and {from the. i-berrel 39 ina bracket 59,-1'The holder- 58' V is ,screw?lthfeadedjpnits; ends ,and; has nuts I L l 'f w itis" aidjnstecl"yer -v spe'cfitclthe barrel fiQ-vjjandi v "166kedf'in atl'j'iistedposit'ion.""*A 'centact Wife 8 to hold the film ingpQsitiontegbefengaged: h 6l.-. ;isj"-, s ecurecl the hqlder 58' and '1s at-.

j by the sprocket Wheel, 15 t0 drive it through 1-the machine; v 137 7 ,1 When in operation,- during there 'roducv-f- "sll'bwii'fait 62, to ihold it egainsti-turning in I the? bracket 59$f The" bracket :59 is alsq 'ad- 7 j'il's 'table laterally-cf thebztrrel 3 9 b'ygrneans 0f pins? 5 63 a'nd' which are secured. in e; bracket- 6'5; 'the'se; pinsfengeging lin sockets in; br'aicket 59's '39: 'Thef'sccket liclder-j 58 is provided with means foi Tholding' af *ceven 71- to protect cell stocket holdei' 77 is mounted to sli dei A socket 885s held --in :memberi end I ries a; light "sensiti' e' :cell 178;} This cel1f may be any. suitable c'ell which iss sensitiye to 5 lightsc thatit"wi illibe ccIidnctiYei nly-When e t 1 h n n :l p n lit" and ini whi h 5 resistance varies" ln ac'crdance with; thegin tensityic'f the-light that isi projected upon it.

Such cells are eILknO n ancl neednct bef i v jfurther described; -:Wev' have found omsv siumffcells operate fefliciently.'--f The {member} 5 i 77 has tensionfsp'r'ings;Z9 .-isecured mint;

one; end j which "springs are secured *at theii fl other end' to" hmcket =74g= these 1 as prin'gs tenda'? ing to withdraw thememberI 177 to its. -,.1"e,a1-'fspring pressed toward the' b'ra'cket'g55 which 1 fmmegengzigesthe back of th e' filrfn '0' holclf Of the the bracket 55 bymeansof aleaf spring 84. In witness whereof, I have hereunto set The light sensitive cell 78 is connected by my hand at Shelbyville, Indiana, this 13th 7 i means of wires 85 and .86 with a battery 87 day of September, A. D nlneteenhundred of suitable voltage and leads to the sound and twenty-nine.

5 reproducing mechanism, It may beneces-j 1 7 WILLIAM sary under most circumstances to amplify the current'a number of times, however, I do not limit myself to a machine in'which the output is amplified for I may find] it 10 possible, under advantageous circumstances, l l 46' to reproduce the sound in the ordinary wayf without amplifiers. j V I It will be obvious to those skilled in the art thatvarious changes may be made in my device without departing from thespirit if v V .80

of the invention and therefore I do not a limit myself to what is shown'in the drawings and described in the specification, but

only as indicated in the appended claims.

Having thus'fullydescribed my said'in-' v Y .3;

vention, whatI claim as new and desire to' a, secure by Letters Patent, is:

1. In an apparatus for reproducing sound from a film on which a record has been I o 2 made, a lamp, a barrel having focussing j p v lenses enclosed therein and spaced apart, slides positioned in said barrel and adjustable toward each other to provide a slit at their adjacent edges, the slit being positioned at the focus point of adjacent lenses, l j i 7 t i i and a perforation in said barrel closed by transparent slide to enable an operator-to see when the light is focussed on the slit, substantially as set forth. a

85 2. An apparatus for reproducing'sound l 1 e ioo from a film on which arecord has been made in terms of light and shadow,-said machine having electric pick-up instrumentalities, a light sensitive cell for varying theelectric currentpassing through saidinstrumental- V 1 1, 1 1

ities, a bracket adapted to receive said cell, means for adjusting'said bracket and sef; curing it in predetermined adjusted position relative to the said film, said adjusting -46 means comprising a cam engageable with '1 l 3 110 the said bracket, substantially as set forth.

3. The combination with a picture project ing machine of asound reproducing device comprising means for projecting a beam of 50 light through that portion of 'the'film on l L o i I which sound has beenpreviouslyrecorded V V in terms of light and shadow, electric pickup' instrumentalities for transforming light variations into sound waves a light sensil5tive cell for varying electric current'passing i w IQQWQ through it in said instrumentalities, a brack et adapted to receive said cell, a cam on said bracket, a manually operable lever having a cam thereon engagea-ble with the .firstg '60 named cam, resilient means biased to move" i 1 1 Q j said bracket away fromthe path of said film, said manually operable meansserv ingto adjust said cell and secure'it in ad justed position. with relation tosaid film substantially as set forth. V I I l io s o l I 

